There is IPv4 or IPv6 every time users see some network settings. As you can imagine, the earlier versions are long enough ago (TCP / IP v1, v2, and v3). Then why is it IPv4 vs IPv6 instead of the 5th vs 6th version? Where did IPv5 go? IPv5 was named ST, the Internet Stream Protocol, in the late '70s. It was used by the likes of Apple, NeXT, and Sun to provide a network-wide service. ST was effective at keeping connectivity while transmitting particular packets of data to selected frequencies. IPv5 was created solely for experimental purposes, especially for video and audio transmission.
IPv5 has never been accepted as an official Internet protocol. The main reason for this is that it is restricted by 32 bits. IPV5 uses the same addressing system as IPv4, and each address consists of four sets of numbers between 0 and 255, which limits the number of possible addresses to 4.3 billion. In the early 1970s, this seemed to be more than the world needed. However, the explosive growth of the Internet proves that this idea is wrong. In the 1990s, a new project began to work on the next generation of Internet Protocol (IPng). This forms 128-bit IPv6. An IPv6 address contains "8 groups of 4-character hexadecimal digits", which can contain numbers from 0 to 9 and letters from A to F. Unlike IPv4, IPv6 has trillions of possible addresses, so we should be safe for a while.
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